It does not matter whether the power goes to the fan unit or to the switch box, you still need 3 insulated wires going between the switich and the fan, and the ground wire as a 4th wire. If power is at switch, you will have white as nuetral feed to fan and 2 blacks (or a red and a black) one each to bring power for light and power for fan or heater element. ( if so equiped). If power is to fan unit, the white wire must have a piece of colored tape (red, orange, blue, brown) and this whtie wire is attached to the black power wire. The tape shows that this is not a neutral. The tape has to be at both ends of the white. Now, the other 2 wires (blk & blk or red & blk) can be atteched to the switch and carry the elec. to the fan light, blower, and or heater. Goodluck, Macgivor
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It does not matter whether the power goes to the fan unit or to the switch box, you still need 3 insulated wires going between the switich and the fan, and the ground wire as a 4th wire. If power is at switch, you will have white as nuetral feed to fan and 2 blacks (or a red and a black) one each to bring power for light and power for fan or heater element. ( if so equiped). If power is to fan unit, the white wire must have a piece of colored tape (red, orange, blue, brown) and this whtie wire is attached to the black power wire. The tape shows that this is not a neutral. The tape has to be at both ends of the white. Now, the other 2 wires (blk & blk or red & blk) can be atteched to the switch and carry the elec. to the fan light, blower, and or heater. Goodluck, Macgivor